package cn.com.sqlite.demo.common.dialect;

import java.sql.Types;

import org.hibernate.dialect.Dialect;
import org.hibernate.dialect.function.SQLFunctionTemplate;
import org.hibernate.dialect.function.StandardSQLFunction;
import org.hibernate.dialect.function.VarArgsSQLFunction;
import org.hibernate.type.StandardBasicTypes;

/**
 * 
 * @Description: 自定义Sqlite Dialect
 * @author Y.Jin
 * @date 2017年2月7日 上午10:23:22
 */
public class SqliteDialect extends Dialect {
	
	public SqliteDialect(){
		registerColumnType(Types.BIT, "integer");  
		  registerColumnType(Types.TINYINT, "tinyint");  
		  registerColumnType(Types.SMALLINT, "smallint");  
		  registerColumnType(Types.INTEGER, "integer");  
		  registerColumnType(Types.BIGINT, "bigint");  
		  registerColumnType(Types.FLOAT, "float");  
		  registerColumnType(Types.REAL, "real");  
		  registerColumnType(Types.DOUBLE, "double");  
		  registerColumnType(Types.NUMERIC, "numeric");  
		  registerColumnType(Types.DECIMAL, "decimal");  
		  registerColumnType(Types.CHAR, "char");  
		  registerColumnType(Types.VARCHAR, "varchar");  
		  registerColumnType(Types.LONGVARCHAR, "longvarchar");  
		  registerColumnType(Types.DATE, "date");  
		  registerColumnType(Types.TIME, "time");  
		  registerColumnType(Types.TIMESTAMP, "timestamp");  
		  registerColumnType(Types.BINARY, "blob");  
		  registerColumnType(Types.VARBINARY, "blob");  
		  registerColumnType(Types.LONGVARBINARY, "blob");  
		  registerColumnType(Types.BLOB, "blob");  
		  registerColumnType(Types.CLOB, "clob");  
		  registerColumnType(Types.BOOLEAN, "integer");  
		  registerFunction("concat", new VarArgsSQLFunction(StandardBasicTypes.STRING, "",  
		            "||", ""));  
		    registerFunction("mod", new SQLFunctionTemplate(StandardBasicTypes.INTEGER,  
		            "?1 % ?2"));  
		    registerFunction("substr", new StandardSQLFunction("substr",  
		            StandardBasicTypes.STRING));  
		    registerFunction("substring", new StandardSQLFunction("substr",  
		            StandardBasicTypes.STRING));  
	}

//	public SQLiteDialect() {  
//		  
//	}

	public boolean supportsIdentityColumns() {
		return true;
	}

	public boolean hasDataTypeInIdentityColumn() {
		return false;
	}

	public String getIdentityColumnString() {
		return "integer";
	}

	public String getIdentitySelectString() {
		return "select last_insert_rowid()";
	}

	public boolean supportsLimit() {
		return true;
	}

	protected String getLimitString(String query, boolean hasOffset) {
		return new StringBuffer(query.length() + 20).append(query).append(hasOffset ? " limit ? offset ?" : " limit ?")
				.toString();
	}

	public boolean supportsTemporaryTables() {
		return true;
	}

	public String getCreateTemporaryTableString() {
		return "create temporary table if not exists";
	}

	public boolean dropTemporaryTableAfterUse() {
		return false;
	}

	public boolean supportsCurrentTimestampSelection() {
		return true;
	}

	public boolean isCurrentTimestampSelectStringCallable() {
		return false;
	}

	public String getCurrentTimestampSelectString() {
		return "select current_timestamp";
	}

	public boolean supportsUnionAll() {
		return true;
	}

	public boolean hasAlterTable() {
		return false;
	}

	public boolean dropConstraints() {
		return false;
	}

	public String getAddColumnString() {
		return "add column";
	}

	public String getForUpdateString() {
		return "";
	}

	public boolean supportsOuterJoinForUpdate() {
		return false;
	}

	public String getDropForeignKeyString() {
		throw new UnsupportedOperationException("No drop foreign key syntax supported by SQLiteDialect");
	}

	public String getAddForeignKeyConstraintString(String constraintName, String[] foreignKey, String referencedTable,
			String[] primaryKey, boolean referencesPrimaryKey) {
		throw new UnsupportedOperationException("No add foreign key syntax supported by SQLiteDialect");
	}

	public String getAddPrimaryKeyConstraintString(String constraintName) {
		throw new UnsupportedOperationException("No add primary key syntax supported by SQLiteDialect");
	}

	public boolean supportsIfExistsBeforeTableName() {
		return true;
	}

	public boolean supportsCascadeDelete() {
		return false;
	}
}
